Bottom view shows Penta-Labs air socket modified for the GS-35b. The filament choke is a B&W
30Amp, 40uH, #10 AWG wound on a 7 1/2" x 1/2" ferrite rod. Purchased from Surplus Sales of
Nebraska, comes complete with mounting hardware. Their part # is (ICH)FC25A. A large ceramic
feed-thru insulator carries the B+ to the upper deck. Just below and left is a 50 Watt 36 Volt
stud mounted Zener diode for tube biasing. Left of it is a 24VDC relay which switches the
biasing zener in on transmit and out on standby to cut off the tube when not in use. The Zener
connects to the C.T. of the 12.6VAC filament transformer. Just below is the relays' 24VDC power
supply consisting of a Stancor 24VAC transformer and full wave bridge rectifier. The positive
(+) lead from the rectifier goes directly to the relay coil, a chassis mounted transistor is
in series with the negative (-) lead and acts as a switch on its way to the relay coil. This
makes a much cleaner PTT connection to the transceiver. Does the Reflective Orange with Black
Letters look familiar? It should...The 1/8 aluminum used in much of this project is a recycled,
never used, "MEN WORKING" sign!